{"id":5774,"number":"23.772","type":"TR","title":"Enhanced Circuit Switched (CS) fallback","series":23,"status":"Draft","initial_release":"Rel-13","primary_group":"S2","secondary_groups":[],"portal_id":875,"portal_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=875","dynareport_url":"https://www.3gpp.org/dynareport/23772.htm","publication_scope":null,"radio_technologies":[],"first_seen_at":"2026-09-16T11:04:50.102693+00:00","updated_at":"2026-10-16T09:34:55.609033+00:00","raw_metadata":{"source_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=875","bibliography_source":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv"},"detail_synced_at":"2026-10-07T23:21:31.706164+00:00","versions":[{"release":"Rel-13","version":"1.0.0","meeting":"SA#66","upload_date":"2014-12-17","comment":"SP-140700","official_file_url":"https://www.3gpp.org/ftp/Specs/archive/23_series/23.772/23772-100.zip","source_url":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv","portal_version_id":null,"version_status":"pre-approval"},{"release":"Rel-13","version":"0.3.0","meeting":"-","upload_date":"2014-12-01","comment":"","official_file_url":"https://www.3gpp.org/ftp/Specs/archive/23_series/23.772/23772-030.zip","source_url":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv","portal_version_id":null,"version_status":"pre-approval"},{"release":"Rel-13","version":"0.2.0","meeting":"-","upload_date":"2014-10-24","comment":"","official_file_url":"https://www.3gpp.org/ftp/Specs/archive/23_series/23.772/23772-020.zip","source_url":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv","portal_version_id":null,"version_status":"pre-approval"},{"release":"Rel-13","version":"0.1.1","meeting":"-","upload_date":"2014-08-19","comment":"","official_file_url":"https://www.3gpp.org/ftp/Specs/archive/23_series/23.772/23772-011.zip","source_url":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv","portal_version_id":null,"version_status":"pre-approval"},{"release":"Rel-13","version":"0.1.0","meeting":"-","upload_date":"2014-07-29","comment":"","official_file_url":"https://www.3gpp.org/ftp/Specs/archive/23_series/23.772/23772-010.zip","source_url":"ftp://ftp.3gpp.org/Information/Databases/3GPPBibliography.csv","portal_version_id":null,"version_status":"pre-approval"}],"release_presence":[{"release":"Rel-13","first_version_date":"2014-07-29","latest_version_date":"2014-12-17","first_version":"0.1.0","latest_version":"1.0.0","version_count":5}],"classifications":[],"work_items":[{"uid":640051,"acronym":"eCSFB","effective_acronym":"eCSFB","title":"Enhanced CS Fallback (CSFB)","responsible_groups":["S2"],"release":"Rel-13","status":"PCG approved","wi_level":"Feature (1st level)","type":"Work Item","first_release":null,"last_release":null,"provenance_type":"official","source_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=875","association_sources":[],"association_status":"historical_unverified"},{"uid":640151,"acronym":"eCSFB","effective_acronym":"eCSFB","title":"TR for Enhanced CS Fallback (CSFB)","responsible_groups":["S2"],"release":"Rel-13","status":"PCG approved","wi_level":"Building Block (2nd level)","type":"Work Item","first_release":null,"last_release":null,"provenance_type":"official","source_url":"https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=875","association_sources":[],"association_status":"historical_unverified"}],"change_requests":[],"relationships":[],"relationship_release_evidence_summary":[],"relationship_release_evidence":[],"relationship_release_evidence_meta":{"total":0,"returned_count":0,"limit":100,"truncated":false,"href":"/api/specs/23.772/relationship-evidence"}}